﻿using System;
class NumberLine
{
    static void Main()
    {
        int number1 = 2, number2 = -3, counter;
        for (counter = 1; counter <= 100; counter++)
        {
            if (counter == 100)
            Console.Write((number1) + "," + (number2));
            else
            Console.Write((number1) + "," + (number2) + ",");
            number1 = number1 + 2;
            number2 = number2 - 2;
        }
            Console.ReadLine();
    }
}
